Which term is applied to the smooth, dark areas of the moon that people once thought were seas?

F500 j of energy were added to 1 kg of each of these samples, which would experience the least temperature increase?

Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.

Iwill give brainliest if you answer right : )